2017 NEC 250.50, 250.52, 250.53: A question for number of required methods of providing grounding electrodes

[fandi]

Hello All,
It's a single service drop 240/120V single phase for a single family residence.
From reading 250.50, 250.52, 250.53, please correct me if I'm wrong:
- If Rod, pipe and plate electrodes are used, a supplemental electrode is required and the supplemental could be a type specified in 250.52(A)(2) through (A)(8).
- If metal underground water pipe is used, a supplemental electrode is required and the supplemental could be a type specified in 250.52(A)(2) through (A)(8).
Now here's my understanding:
If grounding electrode is any type of 250.52(A)(2) through (4), (6) or (8) then no supplemental electrode is required. For example, if the grounding electrode is ufer ground OR ground ring, etc. (as long as it's not 250.52(A)(1), or (5), or (7)) then that method alone is sufficient, no supplemental electrode is required.
Thank you.

 

[ActionDave]

Correct. Only water pipes and ground rods require supplemental grounding electrodes.

 

[augie47]

Be cautious as some POCOs require a ground rod for their meter bases even if not required by the NEC.
(all the ones in this area do so)

 

[infinity]

Be cautious as some POCOs require a ground rod for their meter bases even if not required by the NEC.
(all the ones in this area do so)

It's funny before this forum I had never heard of such a thing. Around here the two local POCO's don't allow any connection of a GEC within the meter enclosure.

 

[fandi]

Thank you ALL.

 

[tom baker]

It's funny before this forum I had never heard of such a thing. Around here the two local POCO's don't allow any connection of a GEC within the meter enclosure.

Our state AHJs won’t allow connection in meter enclosure as it’s not accessible when sealed.

 

[tom baker]

Hello All,
It's a single service drop 240/120V single phase for a single family residence.
From reading 250.50, 250.52, 250.53, please correct me if I'm wrong:
- If Rod, pipe and plate electrodes are used, a supplemental electrode is required and the supplemental could be a type specified in 250.52(A)(2) through (A)(8).
- If metal underground water pipe is used, a supplemental electrode is required and the supplemental could be a type specified in 250.52(A)(2) through (A)(8).
Now here's my understanding:
If grounding electrode is any type of 250.52(A)(2) through (4), (6) or (8) then no supplemental electrode is required. For example, if the grounding electrode is ufer ground OR ground ring, etc. (as long as it's not 250.52(A)(1), or (5), or (7)) then that method alone is sufficient, no supplemental electrode is required.
Thank you.

The other posts mentioned POCO requirements, those vary by POCO. Also local agencies and states make changes to grounding requirements